Rotary pump



Patented June 22, 1948 UNITED STATES PATENT orrica SalvatoreScognamillo, New York, N. Y.

Application May 7,1948, Serial No. 25,610

This invention relates to rotary pumps. engines or compressors of thecrescent chambered type wherein a plurality of radially disposed bladesare positioned in a pressure chamber having a circular peripheral wall,and actuated by an eccentrically positioned rotor; and in particular theinvention relates to a rotary device having radially disposed bladeswith pins extending through the blades and with the ends of thepinsextending into traveling channel-shaped rings in recesses in the ends ofthe housing wherein the rings are concentric to the inner peripheralsurface of the chamber and rotated with the blades.

This invention is a continuation inpart of my co-pending application fora rotary pressure pump or compressor filed September 8, 1947, withtheSerial No. 772,716, now abandoned, in'that the pins in the blades aredescribed as being free to rotate or move longitudinally and thechannelshaped rings are described as adapted to slide or travel with theblades.

The purpose of this invention is to provide an improved rotary pumpwherein radially disposed blades in a rotor are maintained in fixedpositions with their outer edges in continuous wiping contact with theinner surface of the surrounding housing so that both the shock orfriction load caused by the blades sliding into and out of the rotor iseliminated. r

In the usual rotary pump or engine the blades are crowded into openingsin the rotor and a frictional contact of the blades with the surface ofthe surrounding housing causes thrust that results in an excessive loadagainst the corners of the slots of the rotor. Various devices such assprings and air cushions, and the like have been used to increase theefllciency of rotary devices of this type but the lateral thrustcontinues to cause excessive wear as the blades bind in the slots. Withthis thought in mind, this invention contemplates means in a rotarydevice of this type for permanently positioning the blades with theirouter edges outward against the surface of the surrounding housing andan eccentrically moving rotor for actuating the blades which slidesoutward and inward on the blades.

Other attempts have been made to hold the blades by stationary pins atthe ends and also with rollers on the pins but fixed pins for this useare subjected to considerable wear and shear ofl'rap- 3 Claims. (Cl.103-136) 2 idly. For this reason applicant mounts pins freely inopenings through the blades so that the pins are free to-turn as theycontact the surface of the rings and are also free to slide through theblades as uneven surfaces are contacted or as wear develops in theparts.

The object of this invention is, therefore, toim-.

prove the construction of rotary pumps, engines,

compressors and the like wherein blades are held in fixed positions andactuated by a centrally disposed eccentrlc member which merely pushesthe blades along without causing binding in the actuating member. I 7

Another object of this invention is to provide a rotary pump. engine,compressor or the like wherein the blades are mounted in such a mannerthat the device may be actuated at veryhigh speeds.

A furtherobject of the invention is to,provide a rotary pump, engine,compressor or the like wherein radially disposed blades are actuated bya central member which is eccentrically positioned and in which theblades are held by a channelshaped traveling ring through extendingpins,

which is of a simple and economical construc-.

tion.

With these and other objects and advantages in view, the inventionconsists of a housing having a chamber with a circular outer wall andprovided with inlet and discharge cor. iections, a rotor mounted in thehousing and eccentrlcally positioned in the chamber, a plurality ofradially disposed blades positioned in the chamber with the outer edgescontacting the inner surface of the circular wall and with the inneredges slidable in radailly disposed slots in the rotor, and pinsextending longitudinally through the blades and into the channel-shapedrings freely mounted in recesses in the ends of the housing.

Other features and advantages of the invention will appear from thefollowing description taken'in connection with the drawings, wherein:

Figure 1 is a vertical longitudinal section through the pump wth partsbroken away, and shown inelevation.

Figure 2 is a view showing. an end elevation of the pump with the partsassembled, and with the end plate omitted.

Figure 3 is a view showing an end elevation of the rotor with the bladesomitted and illustrating the positions of the blade receiving slotstherein.

Figure 4 is a view showing the pump end plate or cover. v

Figure 5 is a sectional view through the pump cover.

Figure 6 is a cross section through the channelshaped ring that holdsthe extending ends of pins in the blades.

Figure 7 is a view showing a side elevation of one of the blades with apin freely mounted therein.

Figure 8 is a view showing an end elevation of one of the blades.

Referring now to the drawings wherein like reference characters denotecorresponding parts the rotary device of thi invention includes ahousing 8 having a bearing section 2 and a pump chamber 3. The housingis provided with an intake connection 4 and a discharge connection 5with passages 6 and 6' providing communicating means between theconnections and pump chamber 3, respectively.

The bearing section of the housing is provided with a bearing 1 for theshaft 8 on the end of which the rotor 9 is mounted, as shown inFigure 1. The rotor is provided with axially disposed slots I in whichblades II are positioned which extend into the crescent-shaped area l2in the chamber 3. The outer edges of the blades are held in continuousengagement with the peripheral wall l3 of the chamber 3 by pins Mextending through openings Ila in the blades and provided with extendingends l that are positioned in channel-shaped rings l6 which form tracksIT. The openings Ila in the blades are slightly exaggerated in Figure 7to illustrate that the pins are freely positioned in the blades so thatparts without departing from the spirit of the invention.

What is claimed is: 1. In a rotary device, a casing having asubstantially cylindrical chamber with inlet and outthey may rotateindependent of the blades or slide axially therein, and the rings I6 arealso freely positioned in the recesses 20 and 20' in the housing andcover l8, respectively. The ends of the pins frictionally engage therings, dragging the rings around therewith. The pins are floating in theblades and the rings are floating in the recesses.

The cover or end plate I8 is Provided with openings [9. by which it issecured in place on the housing.

With the parts arranged in this manner the blades H are retained outwardwith the outer edges thereof in continuous contact with the peripheralsurface [3 of the chamber 3, by the pins 14, the ends of which extendinto the tracks I! of the rings I6. The pins, being free to turn in theopenings of the blades, are rotated by frictional contact with the ringswhich eliminates the usual excessive wear that develops when the pinsare stationary. The pins are also free to slide back and forth throughthe blades as t e ends contact uneven surfaces in the channels thatresult from warp, wear and the like.

With the blades held continuously outward against the inner wall of thechamber in which they are positioned the device may be rotated atcomparatively high speeds with very little wear.

The inlet and outlet ports are so positioned that the rotor which ispositioned to substantially engage the wall of the chamber at a pointbetween the inlet and outlet ports may be rotated in either direction,that is clockwise or counterclockwise, and as the rotor is rotated theblades travel around the chamber, passing through the crescent-shapedarea, and being held outward in continuous engagement with the inletports therein, a rotor eccentrically positioned in the chamber andhaving substantially radially disposed slots therein, blades in thecylindrical chamber and positioned in the slots of the rotor forrelative sliding movement with the rotor .through the slots thereof,pins freely mounted for rotary and axial movement in and with respect tosaid blades, said pins having ends extending beyond the ends of theblades, and channel shaped rings freely mounted in the housing at theends of the rotor with the ends of the pins positioned in the channelsin the rings and adapted to rotate the rings by frictional contacttherewith, said rings positioned concentrically with respect to thecylindrical chamber and maintaining the outer edges of the blades incontinuous wiping contact therewith.

2. In a rotary device, a casing having a substantially cylindricalchamber with inlet and outlet ports therein, a rotor eccentricallypositioned in the chamber and having slots therein, blades positioned insaid slots for relative reciprocal movement therein, pins freely mountedfor rotary and axial movement in and with respect to said blades, saidpins having ends extending beyond the ends of the blades, and channelshaped rings freely mounted in the housing at the ends of the rotor withthe ends of the pins positioned in the channels in the rings and adaptedto rotate the rings by frictional contact therewith,

said rings positioned concentrically with respect the housing andeccentrically positioned in the chamber with the peripheral surfacethereof engaging the inner wall of the chamber at a point between theinlet and outlet ports, said rotor having axially disposed slots thereinextending inextending into the grooves in the floating rings suspendingthe blades with the outer edges thereof in continuous wiping contactwith the peripheral wall of the chamber and with the inner edges in theslots of the rotor wherein in the operation of the pump the rotor slidesover the blades continuously moving in the chamber,

SALVATORE SCOGNAMILLO.

(References on following page) REFERENCES CITED The following referencesare of record in the file of this patent:

UNITED STATES PATENTS Number Name Date' Bretherton Feb. '7, 1899 ,Hayset a1 Aug. 8, 1899 Fortune-s00 et a1. Sept. 9, 1902 Williams Aug. 7,1906 Loeflier Dec. 18, 1906 Olson Jan. 14, 1919 Munn Nov, 4, 1919Kutchka Apr. 13, 1920 Kuhn Oct. 6, 1931 Number Name Date Cowherd Mar. 2,1943 FOREIGN PATENTS Country Date Great Britain 1875 Great Britain 1882France May 27, 1924 (Addition to 567,879)

Germany Aug. 21, 1890 Great Britain Aug. 19, 1920 Great Britain Dec. 9,1926 Germany Nov. 11, 1925 Germany Apr. 12, 1933 France -1 Mar. 13, 1926

